Interested in names of brokers (and positive or negative experiences with them) whose platforms allow historical data export in a format which can be used for testing in Trading Blox. In general, I've found data exportable to Excel can be manipulated to format accepted by TB.

It would seem to me a big advantage to be able to do testing with data from a broker who you can trade with even if the data might not be the "best" quality from an overall market perspective, so long as it is of "reasonable" quality.

I'm primarily interested in Forex and CFD's for futures. I've used GFT and CMC, data can be exported from GFT but not CMC. Both Ok overall for me, but not all that much experience with either.